html, body {
	height: 100%;
}

.box{
	padding: 0;
	height: 100%;
	/*外边距设为0*/
	margin: 0; 
	background:white;
}

.box .top{
	margin:     0 auto 0 auto;
	background: url(../img/1.jpg);
	width: 800px;
	height: 300px;

}

.box .box-1{
	margin:     0 auto 0 auto;
	text-align: center;
	width: 300px;
	/*height: 50px;*/
}
.box .box-1 .user{
	margin:     0 auto 0 auto;
	text-align: center;
	width: 300px;
	height: 50px;
}

.box .box-1 .key{
	margin:     0 auto 0 auto;
	text-align: center;
	width: 300px;
	height: 50px;
}

.box .box-1 form{
	/*margin:     0 auto 0 auto;*/
	float: left;
	width: 300px;
	height: 50px;
}

.box .box-1 button{
	margin:     0 auto 0 auto;
	text-align: center;
	width: 300px;
	height: 50px;
}
